How one controversial startup hopes to cool the planet

Stardust Solutions, an Israel-based startup, says it can help cool the Earth by flying aircraft into the stratosphere and releasing engineered particles designed to reflect sunlight back into space. The company claims the particles could counter the warming effects of decades of greenhouse-gas emissions.

Stardust raised $60 million, the largest known funding round in solar geoengineering. Founded by prominent scientists, it says it will only move forward if governments request the work and set clear rules and oversight.

Many researchers are alarmed. They argue the science has not been published, the timelines are unrealistic, and a for-profit company should not have incentives tied to managing global temperatures. Others warn the idea could deepen public mistrust and fuel geopolitical tensions.

Stardust says it is preparing an emergency option as climate impacts worsen.

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